User`s guide

5 Model Analysis Tools
5-2
General Model Characteristics
General model characteristics include t he model type, I/O dimensions, and
continuous or discret e nature. Related commands are listed in the table below.
Thesecommands operate on continuous-or discrete-time LTI models or arrays
of LTI models of any type.
General Model Characteristics Commands
class
Display model type ('tf', 'zpk', 'ss',or'frd').
hasdelay
Test true if LTI model has any type of delay.
isa
Test true if LTI m od e l is of specified class.
isct
Test true for continuous-time models.
isdt
Test true for dis crete-time m odels.
isempty
Test true for empty LTI models.
isproper
Test true for proper LTI models.
issiso
Test true for SISO models.
ndims
Display the number of model/array dimensions.
reshape
Change the shape o f an LT I array.
size
Output/input/array dimensions. Used with special
syntax,
size also returns the number of state
dimensions for state-space models, and the number
of frequencies in an FRD model.